Instrument Cluster/Gauge Cluster: Notes

The Instrument Cluster houses the Fuel Gauge, Speedometer with LCD odometer, and the Tachometer. The Gauge Cluster houses the Engine Oil Pressure Gauge, Engine Oil Temperature Gauge, Engine Coolant Temperature Gauge, and the Voltmeter.

The cluster positions all of the analog gauges using PCI bus messages received from the BCM, CAB, ACM and the PCM. Warning indicators are located in the Instrument Cluster and the Gauge Cluster. Most warning indicators are controlled by the cluster in response to external control module messages. Some indicators are cluster controlled based on gauge pointer position. The Instrument Cluster dimming is controlled via PCI bus messages received from the BCM. The Gauge Cluster dimming is controlled using a PWM-hardwire from the Instrument Cluster.

The Instrument Cluster contains the Chime tone generator. The cluster provides a 5-volt pull-up to the BCM, which uses a hardwire low-side driver to control the chime. The cluster monitors the PCI bus and based on information from various modules, and cluster internal parameters, will request chimes from the BCM as well as illuminating the appropriate warning indicators.

The Instrument Cluster will store DTC's, communicate on the PCI bus, display engine information, and display certain information using the DRBIII®.

PCI bus information received from the BCM:

• Odometer Total
• Fuel Level
• Door Ajar
• Dimming Level
• Door Unlock
• Deck Ajar
• Front Fog Lamp
• Rear Fog Lamp (BUX only)
• Lighting Parade Mode
• Ignition Switch Status
• Park Lamp Status
• Low Tire Warning
• High Beam
• Country Code

PCI bus information received from the ABS module:

• ABS Lamp Status
• Brake Fluid Lamp Status
• Brake Warning Indicator
• ABS Warning Indicator

PCI bus information received from the PCM:

• Engine Speed
• Charging System Volts
• Charging System Warning (indicator located in the Volt Gauge)
• Engine Oil Pressure
• Engine Oil Temperature
• Engine Coolant Temperature
• Skip Shift (Amber indicator located in the Tachometer, this indicator also controlled by gauge pointer position)
• MIL Warning Indicator (Service Engine Soon)
• Vehicle Speed

PCI bus information received from the ACM:

• Airbag Lamp Status
• Airbag Warning Indicator
• Seatbelt Lamp Status
• Seatbelt Warning Indicator

The Instrument Cluster receives the following information via hardwire:

• Brake Fluid Level Low
• Park Brake

The Gauge Cluster receives the following information via hardwire from the ACM:

• Passenger Airbag Off

Instrument Cluster controlled warning indicators, based on gauge pointer position:

• Low Engine Oil Pressure Warning (indicator located in the Oil Pressure Gauge)
• Engine Oil Temperature Warning (indicator located in the Oil Temperature Gauge)
• Engine Coolant Temperature Warning (indicator located in the Engine Coolant Temperature Gauge)
• Skip Shift (Red LED, located in the Tachometer)
• Low Fuel Warning